It is vertical to the pipe arrangement and the manufacturing method for the steam turbine and use that the main steam pipe arrangement and reheat pipe arrangement and the steam turbine generation of electricity plant

摘要

PROBLEM TO BE SOLVED: To provide a pipe used for a steam turbine, which employs a centrifugal-cast material having crystal grains uniformly refined, and consequently can raise the temperature of the pipe higher and enhance the reliability of the pipe; a manufacturing method therefor; and a main steam pipe for the steam turbine, a reheating pipe and a steam turbine power plant which use the pipe for the steam turbine.;SOLUTION: The pipe for the steam turbine is made from a martensitic steel material which contains columnar grains that orient in a diametric direction and have crystal grain size numbers of 5 or more in a plane perpendicular to the diametric direction; is manufactured by a centrifugal casting method; and comprises, by mass, 0.05-0.5% C, 1.0% or less Si, 0.05-1.5% Mn, 0.01-2.5% Ni, 8.0-13.0% Cr, 0.05-2.5% Mo, 3.0% or less W, 0.05-0.35% V, 0.01-0.5% Nb, 5% or less Co, 0.01-0.1% N, 0.03% or less B, 0.05% or less Al, and the balance iron with unavoidable impurities.;COPYRIGHT: (C)2007,JPO&INPIT